AirHint found the following cheapest return flights from Seoul (ICN) to Brussels (BRU) in September 2025 (see full year).

Return flights

04 Sep - 11 Sep	Lufthansa
10 Sep - 16 Sep	Etihad Airways
11 Sep - 18 Sep	Etihad Airways
01 Sep - 23 Sep	SWISS
13 Sep - 20 Sep	Finnair
01 Sep - 08 Sep	SWISS
18 Sep - 02 Oct	Qatar Airways
08 Sep - 14 Sep	Lufthansa
12 Sep - 19 Sep	Lufthansa
14 Sep - 20 Sep	Lufthansa
17 Sep - 19 Sep	Etihad Airways
29 Sep - 13 Oct	Thai Airways
24 Sep - 08 Oct	Qatar Airways
23 Sep - 07 Oct	Air Canada

Also check the deals for one-way flights from Seoul to Brussels in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Seoul to Brussels in September from $719

Return flights